EP1615595B1 - Artificial valve prosthesis with improved flow dynamics - Google Patents
Artificial valve prosthesis with improved flow dynamics Download PDFInfo
- Publication number
- EP1615595B1 EP1615595B1 EP04760327A EP04760327A EP1615595B1 EP 1615595 B1 EP1615595 B1 EP 1615595B1 EP 04760327 A EP04760327 A EP 04760327A EP 04760327 A EP04760327 A EP 04760327A EP 1615595 B1 EP1615595 B1 EP 1615595B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- support structure
- artificial
- sinus
- proximal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- A61F2/2412—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body with soft flexible valve members, e.g. tissue valves shaped like natural valves
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- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
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Definitions
- the support frame and attached leaflet When viewed from the side, the support frame and attached leaflet is configured such that the angle (angle a) formed between the opposing leaflets, as carried along the proximal attachment pathway, is substantially less than the angle (angle (3) formed between distal attachment pathways and the vessel walls.
- This configuration results in leaflets having large coaptable area relative to the overall surface area, which improves sealing (including reducing the effects of retraction by the valve material) and allows for larger pockets surrounding the leaflets which, like the sinus, facilitate the creation of larger, stronger vortices of retrograde flow that help close the leaflets and clear away blood or fluid that could otherwise stagnate under conditions where the surrounding pockets are smaller in size.
- the wall-engaging outer edges of the leaflets 26 can be reinforced with a separate frame 32 that is attached to or incorporated into the outer edges 37 to improve sealing with the vessel wall 38.
- a separate frame 32 is depicted in embodiment shown in FIG. 3 in which the frame 32 also serves as the interconnecting means 36 between the proximal and distal section 15,17 of the support structure 11, with the struts 18,19 being laser cut from the same tube used to form the remainder of the support structure 11.
- the basal or distal portion of the pocket 35 adjacent each leaflet is enlarged to facilitate and maximize the size and/or velocity of the flow vortices 55,56 formed therein during retrograde flow.
- these broader pockets have been shown to be especially advantageous in bi-leaflet artificial valve designs implanted in the venous system, these valves exhibiting a marked reduction in thrombus formation as compared to earlier designs.
- FIG. 10 which has a generally (inverted) V-shaped attachment pathway 74, a first vortex 55 is created below which a second, smaller vortex 56 is usually present, usually having opposite flow, which may be at least partially inadequate for clearing away blood pooling about the base of the leaflets 60,61 in a venous valve.
- FIG. 10 which has a generally (inverted) V-shaped attachment pathway 74, a first vortex 55 is created below which a second, smaller vortex 56 is usually present, usually having opposite flow, which may be at least partially inadequate for clearing away blood pooling about the base of the leaflets 60,61 in a venous valve.
- FIGs. 13-18 depict another group of examples configured for maximizing the coaptation distance or region between the leaflets in which the attachment pathway 74 comprises a proximal portion 75 that generally extends along one or more longitudinal attachment struts 49,50 that are generally aligned with the longitudinal axis 64 of the prosthesis and a distal portion 76 that is angled laterally from the longitudinal attachment struts and generally follows the distal attachment struts 51,52 which unlike the embodiment of FIG. 9 , extend laterally outward from the longitudinal struts 49,50 as separate struts.
- the attachment pathway 74 comprises a proximal portion 75 that generally extends along one or more longitudinal attachment struts 49,50 that are generally aligned with the longitudinal axis 64 of the prosthesis and a distal portion 76 that is angled laterally from the longitudinal attachment struts and generally follows the distal attachment struts 51,52 which unlike the embodiment of FIG. 9 , extend laterally outward from the longitudinal struts 49,50
Abstract
Description
- This invention relates to medical devices, more particularly to intravascular valve prostheses and the like.
- The venous system includes a series of valves that function to assist the flow of blood returning to the heart. These natural valves are particularly important in the lower extremities to prevent blood from pooling in the lower legs and feet during situations, such as standing or sitting, when the weight of the column of blood in the vein can act to prevent positive blood flow toward the heart. This condition, commonly known as 'chronic venous insufficiency', is primarily found in individuals in which gradual dilation of the veins, thrombotic events, or other conditions prevent the leaflets of the native valves from closing properly. This leads to significant leakage of retrograde flow such that the valve is considered 'incompetent'. Chronic venous insufficiency is a potentially serious condition in which the symptoms can progress from painful edema and unsightly spider or varicose veins to skin ulcerations. Elevation of the feet and compression stocking can relieve symptoms, but do not treat the underlying disease. Untreated, the disease can impact the ability of individuals to perform in the workplace or maintain their normal lifestyle.
- To treat venous valve insufficiency, a number of surgical procedures have been employed to improve or replace the native valve, including placement of artificial valve prosthesis. These efforts have met with limited success and have not been widely adopted as a method of treating chronic venous insufficiency. More recently, the search has been to find a suitable self-expanding or radially-expandable artificial valve that can be placed using minimally invasive techniques rather than requiring open surgery and its obvious disadvantages. Thus far, use of prosthetic venous valves has remained experimental only.
- While attempts have been made to mimic the function of the natural valve, there is no expandable valve for venous transcatheter placement that includes a combination of the native structural features that individually or collectively, may prove highly advantageous or critical for a successful valve. One common problem evident from early experiences with prosthetic valves is the formation of thrombus around the base of the leaflets, probably due at least in part to blood pooling in that region. In a natural valve, the leaflets are typically located within a sinus or enlargement in the vein. There is some evidence that the pockets formed between the leaflets and the walls of the sinus create vortices of flowing blood that help flush the pocket and prevent blood from stagnating and causing thrombosis around the valve leaflets, which can interfere with the function of the valve. It is thought that the stagnating blood prevents oxygen from reaching the endothelium covering the valve cusps, leading to hypoxia of the tissues which may explain increased thrombus formation typical in that location. Expandable-frame valve prostheses typically are of a generally cylindrical in shape and lack an artificial sinus or pocket space that is sufficient for simulating these natural blood flow patterns. What is needed is an intravenous placed artificial valve that is configured to create more effective flow patterns around the valve structure to circulate the blood or bodily fluids and reduce the likelihood of stagnation and the potential clinical problems that may result.
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WO 03/030776 A (Gabbay Shlomo - The foregoing problems are solved and a technical advance is achieved in an illustrative valve prosthesis, such as an artificial venous valve, having a valve structure and a self-expanding or otherwise expandable support structure that upon deployment within the vein, helps create an artificial sinus or larger pocket in the vessel surrounding the valve structure of sufficient size and shape to stimulate flow patterns or vortices which facilitate clearing of the blood or other bodily fluid that would otherwise pool therein. The structural adaptations result in more turbulent flow, increased velocity of flow, larger and/or more numerous vortices, other factors, or a combination of the above that prevent stagnant, hypoxic areas from occurring around the valve structure. Furthermore, the modified flow may also contribute to helping close the leaflets to form a seal and prevent leakage of fluid back through the valve. The artificial sinus or enlarged pockets simulate the function of the natural sinus that exists at the site of most natural valves in the deep veins of the lower legs and which may explain why the problem of thrombus forming around the valve structure has been observed to be a common problem in prosthetic venous valve designs lacking such a sinus area.
- Thus according to a first aspect of the present invention there is provided a radially expandable artificial valve prosthesis for deployment in a bodily passage, having a proximal and a distal end, and comprising: a valve structure adapted for restricting distal fluid flow therethrough; a support structure attached to the valve structure, wherein at least a portion of the support structure is adapted to expand upon deployment to create at least one pocket in the bodily passage adjacent said valve structure which is configured to create retrograde flow patterns sufficient to substantially prevent stagnation of fluid therein.
- Optionally, said pockets may comprise an artificial sinus in the bodily passage, and wherein preferably the support structure is expandable to a particular diameter upon deployment, and wherein the valve prosthesis is configured such that the artificial sinus comprises a portion of the bodily passage that is substantially unsupported by the support structure such that the artificial sinus is adapted to assume a diameter that is larger than the deployment diameter of the adjacent support structure. Wherein more preferably, the sinus has a proximal and distal end such that support structure include a first portion disposed adjacent to the proximal end of the sinus and an interconnecting second portion adjacent to the distal end of the sinus. Wherein still more preferably, the first and second portions of the support structure are interconnected by a pair of oppositely placed struts. Wherein still more preferably, the valve structure is connected at least in part to the oppositely placed struts.
- Optionally, the support structure may comprise a first end and a second end, wherein the valve structure is located about the first end and the first end of support structure has an enlarged diameter that is configured to create the artificial sinus about the valve structure.
- Optionally, the expandable support structure may include an intermediate portion, a proximal portion, and a distal portion; wherein the intermediate portion has a diameter that is larger than the diameter of the distal and proximal portions such that an artificial sinus is created thereabout. Wherein optionally, the intermediate, proximal, and distal portion comprise interconnected segments. Wherein still more preferably the intermediate portion comprises a first and a second radially expandable anchoring portion that each include a first end, a second end and at least one constraining mechanism configured with the first end and the second end of the first and second radially expandable anchoring portion being of different diameters such that the first and second radially expandable anchoring portions collectively form the artificial sinus.
- Optionally, said valve structure includes at least two leaflets adapted to restrict fluid flow therethrough. Wherein preferably, each of the leaflets is oriented closely with the longitudinal axis of the bodily passage throughout the majority of the lengths thereof with the distal portions thereof extending circumferentially and distally to form a sea! with at least one of the waits of the bodily passage and the support structure. Wherein preferably said support structure has a first section that includes at least two commissural points and a second section located distal thereto; wherein each of said plurality of leaflets has an outer edge that includes a first edge portion extending distally from one of said commissural points and a second edge portion extending distally from another of said commissural points. Wherein still more preferably the first and second edge portions generally converge about the second section at a bottom edge such that the plurality of leaflets collectively form a seal with the walls of the bodily passage and cooperate with one another to restrict fluid flow therethrough. Wherein still more preferably the first and second edge portions are each attached to the support structure along an attachment pathway that includes a first, proximal portion comprising a substantial portion of the length of the prosthesis having primarily a longitudinal orientation with respect to the longitudinal axis of the prosthesis, and a second, distal portion angling obliquely from the first portion such that each of said plurality of leaflets comprises an extensive coaptable portion that defines the side of one of said pockets located adjacent to the respective leaflet, and a basal portion that defines the bottom of the respective pocket when the prosthesis is implanted within the vessel. Wherein still more preferably each edge portion is attached about a longitudinal attachment strut that extends from the respective commissural point along the proximal portion of the respective attachment pathway. Wherein still more preferably the support structure further comprises distal attachment struts extending distally and circumferentially from said longitudinal attachment struts; and wherein each outer edge portion is attached proximally along the longitudinal attachment struts to form said coaptable portion, and distally along the distal attachment struts, which converge laterally and carry the bottom edge of each of the plurality of leaflets such that the prosthesis is adapted for forming said seal with the walls of the bodily passage. Wherein still more preferably the longitudinal attachment struts are sized to create a coaptable portion that comprises 10-80%, preferably 30-60%, and more preferably 35-55% of the length of the valve structure. Preferably, said support structure further comprises:a series of proximal bends comprising commissural points for the attachment of said leaflets and adjacent distal bends located therebetween, wherein the proximal bends generally define a first angle and the distal bends generally define a second, larger angle such that the leaflets maintain an orientation that is substantially parallel with the bodily passage as they extend proximally from the proximal bends before curving outward to engage at least one of the support structure and the vessel wall; and wherein the orientation of the leaflets is configured such that said pockets are created adjacent the proximal surfaces thereof.
- Optionally the radially expandable artificial valve prosthesis further comprising a covering of material extending over said support structure; wherein said support structure includes a first section having a first diameter and a second section attached distally to the first section having a second diameter substantially smaller than the first diameter such that distal flow increases in velocity as it passes through the second section; and wherein the valve structure is located within the second section such that said pockets are formed between the valve structure and the support structure.
- Preferably, the support structure comprises a superelastic material and more preferably comprises nitinol.
- In one described arrangement, the collapsible support structure of the valve prosthesis is expandable to a particular diameter upon deployment, with the valve prosthesis being configured such that the prosthesis includes an intermediate, substantially 'open' section such that the artificial sinus is created by a portion of the duct or vessel that is substantially unsupported by the support structure. The unsupported portion of the vessel can advantageously assume a diameter that is larger than the deployment diameter of the vessel-anchoring or 'closed' sections or portions of the collapsible support structure, thereby creating an artificial sinus as blood (or bodily fluid) exerts pressure on the unsupported portion of the vessel wall. In one exemplary embodiment, the expandable support structure comprises a first, proximal portion and a second, distal portion that are interconnected by one or more thin members or struts, such that the largely unsupported region between the first and second (proximal and distal) sections of the support structure forms an artificial sinus (proximal being defined herein as have the same positional orientation as the orifice or opening of the valve structure, which is typically toward the heart in a venous valve). The valve structure is attached about the support structure such that it is largely situated within the unsupported region forming the artificial sinus. For example, the valve structure (defined herein as one or more cooperating leaflets, tubular members, or any flexible structure adapted to seal a passageway in response to changing fluid pressure differentials thereacross) may be attached to the interconnecting members, which can comprise oppositely placed struts having attachment points, (e.g., suture or any suitable structure or method) to facilitate attachment of the valve material.
- In another described arrangement, the expandable support structure of the valve prosthesis comprises a framework or anchoring portion having an intermediate region that includes an enlarged diameter configured to create an artificial sinus about the valve structure, which is attached inside the intermediate region. In one embodiment, the support structure is made of a superelastic material, such as nitinol, and the intermediate region comprises an expanded or bulging portion that is formed by heat setting the nitinol tubular frame around a mandril or other fixture of the desired configuration using a method well known in the medical arts. The intermediate portion expands to a diameter larger than the proximal and distal portions when the prosthesis is deployed from the delivery system, thereby producing larger pockets around the valve structure which create more effective flow patterns to reduce pooling. In another embodiment, the proximal, distal, and intermediate sections are separate, interconnected sections, such as zig-zag frame or other expandable or self-expanding support or anchoring frames. The intermediate section comprising the artificial sinus includes a first and a second radially expandable or self-expanding portion in which the adjoining ends of each are larger in diameter than the ends which adjoin the proximal and distal sections, respectively. The frustoconical shape of the respective intermediate sections can be accomplished by either forming the section into that shape (i.e., plastic deformation of a tubular prosthesis, heat setting nitinol, laser cutting a frustoconical section of tubing, etc.) or a constraining means, such as a suture or thing wire, can be used to manipulate the relative diameters by feeding the constraining means through the apices of the bend or apertures therein and applying the appropriate amount of tension to create the desired shape. Optionally, a tubular or band-like section can be positioned between opposing frustoconical sections to create a longer artificial sinus.
- In yet another described arrangement, the proximal end of the collapsible support at which the valve structure is located is expanded (e.g. flared outward) such that the expanded end or a combination of the expanded end and adjacent are of the vein forms the artificial sinus.
- In still yet another described arrangement, the proximal and distal sections are configured to include a substantially open area between them with the valve structure being attached to the distal section such that it is positioned just below the artificial sinus. Optionally, a sleeve of a biomaterial (e. g a bioremodelable material such as small intestinal submucosa (SIS) or another collagenous extracellular matrix) or fabric can be attached over the proximal and distal sections such that it forms a seal between the prosthesis and the vessel wall, including the artificial sinus.
- In still yet another described arrangement, the support structure of the prosthesis is configured such that the attachment pathway (defined herein as the interface between the lateral, outer edges of the leaflets and the struts and/or vessel walls to which they are attached to establish and define the shape and configuration of the plurality of leaflets comprising the valve structure as deployed) has a first, proximal portion in which the one or more longitudinal attachment struts extending from the proximal bends or commissures that carry and support the proximal outer edges of the leaflets (and span the orifice) have a strongly longitudinal orientation with respect to the longitudinal axis of the prosthesis and valve structure, and a distal portion of the attachment pathway that extends circumferentially (laterally) and distally from the longitudinal axis to form the bottom or distal edge of the outer leaflet edge or perimeter. When viewed from the side, the support frame and attached leaflet is configured such that the angle (angle a) formed between the opposing leaflets, as carried along the proximal attachment pathway, is substantially less than the angle (angle (3) formed between distal attachment pathways and the vessel walls. This configuration results in leaflets having large coaptable area relative to the overall surface area, which improves sealing (including reducing the effects of retraction by the valve material) and allows for larger pockets surrounding the leaflets which, like the sinus, facilitate the creation of larger, stronger vortices of retrograde flow that help close the leaflets and clear away blood or fluid that could otherwise stagnate under conditions where the surrounding pockets are smaller in size. As used herein, the term 'retrograde flow' is defined as bodily fluid travelling in a distal direction (toward the feet),
whether due to gravitational forces, redirection due to contact with the prosthesis or bodily lumen walls, or by some other means. - A first construction of this described arrangement includes a frame comprising a pair of longitudinal attachment struts originating from each commissure bend. The struts extend in generally longitudinal direction, diverging relatively or not at all toward the distal end of the prosthesis before more acutely diverging as they curve laterally and circumferentially away from the proximal strut portions such that the transition between the proximal and distal portions of attachment pathway comprises a bend having a radius that is distinctly smaller than that of the adjacent strut portions (the proximal portions being straight some constructions). The distal attachment pathways converge to define the bottom outer edge of each leaflet. In a second construction of this described arrangement, the support frame of the prosthesis includes a pair of substantially parallel longitudinal attachment struts to which the leaflets are attached to form the proximal portion of the attachment pathway, and distal attachment struts extending circumferentially and laterally outward from the substantially parallel struts to form the distal portion of the attachment pathway. The support frame carrying the valve structure may be advantageously comprised of radial sections (e.g., quadrants in a bicuspid valve) that are of an identical pattern but with alternating orientation such as to provide for radial stability and better expandability characteristics. The radial section not carrying the leaflet proximal outer edges serves as lateral support structure for adding longitudinal stability and help protecting the leaflets from adhering to the vessel walls. The parallel struts provide for advantageous bending and torsional characteristics such that the frame has utility as a stent. In an alternate construction of the support structure, the lateral outer edges of the opposing leaflets can be attached to single longitudinal attachment strut having a pair of distal struts extending laterally outward and circumferentially to carry the bottom half of the leaflet and define the overall shape thereof. The strut may be thicker than adjacent struts and include aperture therealong for facilitating attachment of the valve structure.
- In still yet another described arrangement, the proximal section of the valve is wider in diameter at its proximal end, which anchors the prosthesis in the vessel, and narrower at the interface between the proximal and intermediate sections. This, in combination with a leaflet structure that maximizes pocket size, results in retrograde flow being subject to a Venturi effect which increases flow and the strength of the vortices to close the valve and clear the pockets of potentially stagnating fluids.
- The configuration of the basic units of the support structure and valve structure is not particularly critical for an understanding of the invention. Numerous examples are well known in the prior art and may be found in the disclosure of Applicant's provisional application Ser. No.
60/403,783 - Embodiments of the present invention will now be described by way of example with reference to the accompanying drawings, in which:
-
FIG. 1 depicts a cross-sectional view of a native venous valve and retrograde blood flow pattern; -
FIG. 2 depicts a schematic view of an illustrative embodiment of the present invention in which the prosthesis includes interconnecting proximal and distal sections defining an intermediate, substantially open section for creating an artificial sinus in the vessel ; -
FIG. 3 depicts a schematic view of a second illustrative embodiment of the present invention in which the proximal and distal sections are interconnected by a frame that is incorporated into the valve structure of the prosthesis; -
FIG. 4 depicts a schematic view of an illustrative embodiment of the present invention in which the intermediate section of the prosthesis comprises an expanded portion of the support structure; -
FIG. 5 depicts a schematic view of an illustrative embodiment of the present invention in which the proximal end is expanded to create an artificial sinus about the valve structure; -
FIGs. 6-7 depict side views of embodiments of the present invention in which artificial sinus comprises a plurality of separate support sections; -
FIG. 8 depicts a partially sectioned side view of an embodiment of the present invention that includes an external sleeve of material; -
FIG. 9 depicts a perspective view of a support structure not part of the present invention adapted to increase coaptation of leaflets and pocket size within the vessel; -
FIGs. 10-11 depict side views comparing the flow patterns in a standard valve leaflet configuration with those ofFIG. 9 ; and -
FIG. 12 depicts an example not part of the present invention having a combination of a narrowed intermediate section and the valve structure configuration ofFIG. 9 . -
FIG. 13 depicts a side view of an example not part of the present invention in which the leaflets are attached to the parallel struts to increase the area of coaptation; -
FIG. 14 depicts a side view of the example ofFIG. 13 that is rotated 90° therefrom. -
FIG. 15 depicts a top view of the example ofFIG. 13 . -
FIG. 16 depicts an unrolled view of the support frame of the exampleFIG. 13 ; -
FIGs. 17-18 depict unrolled views of additional examples not part of the present invention for increasing the area of leaflet coaptation; -
FIGs. 19-20 depict plan views of adaptations in the support structure for affixing the valve structure thereto; and - FIG. 21 depicts a partially sectioned perspective view of an example in which the support structure does not co-extend along the entirety of the leaflet outer edges.
- The present invention, selected examples of which are illustrated in
FIGs. 2-9 ,11-20 , comprises a collapsible, self expanding or otherwise expandableartificial valve prosthesis 10 that is deployed within abodily passageway 20, such as a vessel or duct, of a patient typically delivered and implanted using well-known transcathetertechniques for self-expanding prostheses, the valve prosthesis having a first orproximal end 13 and a second ordistal end 14, with the normal, antegrade fluid flow typically traveling from the distal end to proximal end of the prosthesis, the latter being located closest to the heart in a venous valve when placed within the lower extremities of a patent. Thevalve prosthesis 10 comprises asupport structure 11 and avalve structure 12, such as the illustrative valve structure, attached about the support structure and configured to selectively restrict fluid flowing therethrough by closing with changes in the fluid pressure differential, such as in the presence of retrograde flow. The present invention includes structural features that modify the flow dynamics within the prosthesis such that fluid collecting inpockets 35 near the base of theleaflets 26 is more likely to be flushed away or effectively mixed with fresher incoming bodily fluid on a continual basis. - It should be understood that the materials used to comprise the
support structure 11 can be selected from a well-known list ofsuitable metals and polymeric materials appropriate for the particular application, depending on necessary characteristics that are required (self-expansion, high radial force, collapsibility, etc.). The materials used for thevalve structure 12 can comprise a synthetic material or biologically-derived material appropriate for the clinical application; however, investigational studies have demonstrated that a bioremodelable material (such as an collagenous extracellular matrix (e.g., small intestinal submucosa), pericardial, or a growth factor-enhanced material may have superior anti-thrombogenic properties within the body as the native cells and tissues gradually replace the original leaflet material. The number of leaflets possible for embodiments of the present invention can be two, three, four, or any practical number, but bi-leaflet valves may prove advantageous in low-flowvenous situation as compared to tri-leaflet embodiments, such the type used as heart valves which are subject to high-flow situations where thrombus formation is far less of a problem. - In the embodiments of
FIGs. 2-8 , thesupport structure 11 is configured such that when the device is deployed within thebodily passage 20, such as a vein of the lower legs or feet, anartificial sinus 34 is formed adjacent to and surrounding thevalve structure 12 such that the blood or other bodily fluids collecting within thepockets 35 formed around the bases of thevalve leaflets 26 is more likely to be flushed out on a continual basis due to the advantageous geometry created by theartificial sinus 34. The principle is illustrated in the example ofFIG. 1 which shows a naturalvenous valve 21 in whichretrograde blood 22 flowing or falling back down and closing the valve is thought to create a series ofvortices 23 as it contacts the leaflets. It is believed that the rounded shape of the enlargednatural sinus 37 surrounding thevalve 21 facilitates creation of these vortices, thereby preventing blood from pooling or stagnating within thepockets 35 at the base of thevalve 21, which may lead to thrombus formation or other problems. The present invention, by virtue of the configuration of thesupport structure 11, creates anartificial sinus 34 that attempts to reproduce the function served by thenatural sinus 37 in the vein. -
FIG. 2 depicts a side view of an illustrative embodiment of the present invention in which theprosthesis 10 includes a first orproximal section 15 and a second or distal section17 that are spaced apart from one another, defining an intermediate, substantiallyopen section 16 for creating theartificial sinus 34 in thevessel 20. The term 'substantially open' is used herein to define a largely unsupported portion of the bodily passage in which at least some minimal interconnecting structure (e.g., thin or flexible elements aligned with the leaflet commissures) is present that traverses the unsupported portion of the bodily passage, but it comprises very limited surface area and typically supplies minimal, if any, force against the walls of the passageway lateral to thevalve structure 12. The proximal anddistal sections anchoring portions 24, are joined by an interconnecting means 36, such as the illustrative pair of connection struts 18,19 that allows theintermediate section 16 to be otherwise open and free of scaffolding so that thevein walls 38 along that section of thevessel 20 are able to expand due to pressure exerted by the blood flowing within the vein. - In the embodiments of the present invention, the anchoring
portions 24 may function as stents to help the bodily passage remain patent, but their primary function is limited to engaging the bodily passage to anchor the prosthesis thereagainst. Thesupport structure 11 and anchoringportions 24 also may be configured to be readily collapsible as with a normal vein. Since the diameters of the proximal anddistal sections artificial sinus 34. Although the interconnecting means 36 advantageously permit the proximal anddistal sections valve prosthesis 10 comprise separate unconnected sections that are deployed sequentially at an effective distance from one another to create anartificial sinus 34 therebetween. Additionally, the interconnecting means 36 can comprise suture, fabric, or some other non-rigid material to join the proximal anddistal sections intermediate section 16, without interfering with the creation of theartificial sinus 34. To deploy aprosthesis 10 having a flexible interconnecting means 36, one of either the proximal or thedistal sections - In the illustrative embodiment, the
valve structure 12 comprises a pair ofleaflets 26 that are situated in the intermediate section and attached to theproximal section 15 at twocommissural points leaflets 26 are attached about theirdistal ends 29 to thedistal section 17 of thesupport structure 11 using the same or an other suitable attachment means 30. Thevalve structure 12 is configured so that it advantageously expands with the deployment of the proximal anddistal sections outer edges 39 thereof contact the vessel wall sufficiently to at least substantially prevent leakage of bodily fluid around thevalve structure 12. Optionally, the wall-engaging outer edges of theleaflets 26 can be reinforced with aseparate frame 32 that is attached to or incorporated into theouter edges 37 to improve sealing with thevessel wall 38. An example of such aframe 32 is depicted in embodiment shown inFIG. 3 in which theframe 32 also serves as the interconnecting means 36 between the proximal anddistal section support structure 11, with thestruts 18,19 being laser cut from the same tube used to form the remainder of thesupport structure 11. The valve frame 32 (that portion of thesupport structure 11 that reinforces the valve structure 12) can either be configured to exert relatively little radial force beyond what might be required to ensure adequate contact with thevessel wall 38, or it may be configured such that theframe 32 exerts sufficient radial force such that it assists in creating anartificial sinus 34 in the portion of the vein along theintermediate section 16 of thevalve prosthesis 10. - Another method of creating the
artificial sinus 34 is depicted inFIGs. 4-5 , whereby thesupport structure 11 includes an expandedportion 31, larger in diameter than the remainder of thesupport structure 11, that upon deployment, creates anartificial sinus 34 surrounding thevalve structure 12. The diameter of theartificial sinus 34 caused extending thevessel wall 38 is, at its widest point, preferably about 10-120% larger than the diameters of the proximal anddistal sections distal section intermediate section 16 is curvilinear, creating a bulge-like or flared configuration (FIGs. 4 and 5 , respectively). In the examples depicted, the support structure comprises a single tubular anchoring portion 24that is plastically, resiliently, or otherwise deformed into a second configuration that includes the expandedportion 31. For example, the anchoringportion 24 can be laser cut from a tube of nitinol, placed around a mandril having the desired shape, and heat set to produce the final desired shape. In the embodiment ofFIG. 4 , the expandedportion 31 comprises theintermediate section 16 of theprosthesis 10, such that theartificial sinus 34 is created between the proximal anddistal sections valve structure 12 is located therein. InFIG. 5 , the expandedportion 31, which comprises theproximal section 15 of thesupport structure 11, includes a flared configuration that extends outward from the distal section 17 (no separately functionalintermediate section 16 is present). Thevalve structure 12 is attached about theproximal end 13, while the flared, expandedportion 31 thereabout causes thevessel 20 to bulge outward, thus creating anartificial sinus 34 about the proximal end of theprosthesis 10. Theartificial sinus 34 comprises a combination of a supported and an unsupported portion in the embodiment ofFIG. 5 . In both illustrative embodiments thevalve structure 12 is sewn to thestruts 33 of the support structure within the passageway of the anchoringportion 24. Other alternative methods of attachment include adhesives, staples or other fasteners, wire, engagement barbs on the frame, tissue welding, etc. -
FIGs. 6-7 depict embodiments similar to that ofFIG. 5 , except that the proximal, intermediate, anddistal sections illustrative thread material 42 or suture through theapices 45 of adjoining bends and securing it therearound. In the embodiment ofFIG. 6 , theintermediate section 16 comprises a first and a secondintermediate subsection anchoring portion 24 that are coupled to form theartificial sinus 34. The first andsecond subsections portion 24 into that shape, or by increasing constraint of the frame about the distal end of a cylindrical-shapedproximal portion 15 and the proximal end of a cylindrical-shapeddistal portion 17 with a constrainingmeans 42, such as thread, suture, wire, band, covering, etc., so that therespective sections means 42 may be included at the first and second ends 13,14, as depicted, to maintain the cylindrical shape of the proximal and distal 15,17 sections. The thread or suture 30 (constraining means) at the interface 46 interconnecting the first and secondintermediate subsections apices 45 of those respective subsections. The illustrative embodiment ofFIG. 7 is similar to that ofFIG. 6 except that theintermediate section 16 also comprises a thirdintermediate subsection 43, located betweenintermediate subsection intermediate section 43 comprises a short cylindrical or band-shaped portion whose width can be adjusted to create the desired geometry of theartificial sinus 34. Additional subsections can be added as well, if so desired. -
FIG. 8 depicts an embodiment in which thesupport structure 11 comprises aproximal portion 15 joined to adistal portion 17 by a interconnectingstrut 36, the entire support structure being cut from a single piece of cannula, such as stainless steel or nitinol. Thevalve structure 12, comprising a plurality ofleaflets 26, is attached to thedistal portion 17 such that theartificial sinus 34 is formed in the largely open, unsupported region between the proximal anddistal sections vessel 20 bulging outward, as in the embodiment ofFIG. 2 . Thevalve prosthesis 10 further includes anoptional covering 44, such as an outer sleeve of SIS (or other suitable biological or synthetic material), that is attached to both the proximal anddistal sections support structure 11, which helps seal the prosthesis to prevent leakage of retrograde fluid therearound. The covering 44 is preferably of a constitution and configuration such that it does not interfere with the creation of theartificial sinus 34. -
FIGs. 9,11 , and13-20 comprise examples of anartificial valve prosthesis 10 in which supportstructure 11 carrying theleaflets 26 is configured to increase the leaflet contact (coaptable)area 57 about the proximal portion of thevalve structure 12 without relying on built-in slack within the material to bring the leaflets in closer proximity and provide for a extensive sealing area, longitudinally. As defined in this application, theleaflet contact area 57 comprises a longitudinal portion along thevalve structure 12 in which the facing surfaces of opposing leaflets 26 (two or more) coapt or lie in close proximity to one other while in a dry or resting, neutral state (i.e., the pressure differentials across the valve orifice are essentially equalized such that the leaflets are not being forced together or apart due to external forces, such as fluid flow), when the prosthesis is an expanded or deployed configuration. Thesupport frame 11 may be configured for maximizing the extent of theleaflet contact area 57 by including one or more longitudinal attachment struts 49,50 that define at least theproximal portion 75 of theattachment pathway 74 of each leaflet lateralouter edge 87,88 (the termsouter edge 39 and lateralouter edges proximal attachment pathways 75 have a substantially longitudinal orientation (e.g., substantially parallel) with respect to thelongitudinal axis 64 of the prosthesis (and valve structure 12). At a point generally proximate thedistal end 89 of the leaflet contact area 57 (theproximal portion 96 of the leaflet), thedistal portions 76 of the adjacent attachment pathways 74 (which are joined proximally about a commissural point) diverge from one another (forming a generally Y-shaped pathway configuration) and assume a much more circumferential orientation than that of theproximal portion 75 ofthe pathway such that the outer leaflet lateral edges 87,88 of each leaflet converge at a point lateral to the freeinner edge 84 thereofto seal the passageway and form thedistal portion 96 of the leaflet that defines the bottom 96 or 'floor' of thepocket 55 or intravascular space adjacent the outer surfaces of each of the leaflets, which generally assumes a strongly cupped or curved shape such that the leaflet assumes a generally 'folded' appearance due to the acutelyangled attachment pathway 74 with the proximal portion ofthe leaflet having a strong longitudinal orientation with respect to the prosthesis and vessel and thebottom portion 96 having a strongly perpendicular orientation relative to the longitudinal axis of the vessel and prosthesis. It should be noted that thecommissures proximal end 13 of theillustrative prosthesis 10, may be located proximal thereto such thatadditional support structure 10 extends proximally, such as in the embodiments ofFIGs. 2-8 ,12 . - By extending or maximizing the leaflet contact area and decreasing the radius of the curvature of the leaflet (increasing curvature) about the distal portion thereof, the basal or distal portion of the
pocket 35 adjacent each leaflet is enlarged to facilitate and maximize the size and/or velocity of theflow vortices pocket 35 of stagnant blood that can thrombose and compromise valve function or lead to other complications is depicted in a comparison ofFIGs. 10 and 11 . Laboratory analysis of the patterns of retrograde flow within a valve has shown that multiple vortices are typically created. In the embodiment ofFIG. 10 , which has a generally (inverted) V-shapedattachment pathway 74, afirst vortex 55 is created below which a second,smaller vortex 56 is usually present, usually having opposite flow, which may be at least partially inadequate for clearing away blood pooling about the base of theleaflets FIG. 11 , which has a generally (inverted) Y-shapedattachment pathway 74, the larger pocket (at least at the basal portion) allows for a larger and strongersecond vortex 56 of fluid created by retrograde flow that is more optimal for clearing away any pooling blood that would otherwise collect there and potentially provide for greater downforce on theleaflets -
FIGs. 9 and 11 depict an artificialvenous valve prosthesis 10 in which theframe 32 of thesupport structure 11 is configured such that the pair of longitudinal attachment struts 49,50 extending from each of thecommissures legs 58 of the frame 32), and the inside 63 of thevessel wall 38. Thefirst angle 47 is preferably between -10 and 30° (a negative angle being possible with a sufficiently large-radius bend about the commissure) with a more preferred angle being 0-25° and a most preferred angle of 0-10°. The longitudinal attachment struts 49,50 may both diverge and converge at various points therealong (i.e., bow inward or outward), which in case, the first angle may be relevant for only theproximal portion 75 or is measurable between vectors representing the best straight line longitudinallytraversing eachstrut arms legs 58,59 to help center theprosthesis 10 within thevessel 20. Ideally, the angles depicted in theframe 32 configuration ofFIG. 11 results in the opposingleaflets angles FIG. 10 , particularly over the proximal half oftheleaflets leaflets leaflets -
FIGs. 13-18 depict another group of examples configured for maximizing the coaptation distance or region between the leaflets in which theattachment pathway 74 comprises aproximal portion 75 that generally extends along one or more longitudinal attachment struts 49,50 that are generally aligned with thelongitudinal axis 64 of the prosthesis and adistal portion 76 that is angled laterally from the longitudinal attachment struts and generally follows the distal attachment struts 51,52 which unlike the embodiment ofFIG. 9 , extend laterally outward from thelongitudinal struts FIG. 9 , the distal attachment struts/portions converge at a point oppositely facing eachleaflet lateral support structure FIGs. 13-17 , thesupport frame 11 further includesproximal support arms lateral support structure 53,54 (also shown inFIG. 15 ). - The example depicted in
FIGs. 13-14 comprises a pair of longitudinal attachment struts 49,50, generally parallel to one another, which are adapted for attaching therespective leaflets 26 therealong, thus creating a large leaflet contact orcoaptable area 57 that extends over half of the length of the prosthesis. As depicted inFIG. 16 , Thelateral support structure support structure 11 generally forms a serpentine configuration adapted to be readily collapsible and expandable. In the illustrative embodiment, thesupport structure 11 or frame can be divided into four sections orquadrants sections commissures valve structure 12 being oriented proximally toward thefirst end 13 of theprosthesis 10. The repeating, uniform design of thesupport structure 11 of the illustrative embodiment advantageously provides better structural stability, compressibility/expandability, and overall integrity than a support structure that does that comprise a non-uniform, non-repeating frame pattern. - The
lateral arms lateral support structure strut 68 that carries a proximalradiopaque marker 67 used to facilitate orientation of thedevice 10 and provide additional support. An identicaldistal strut 90 and an optionalradiopaque marker 91 is located distal to the longitudinal attachment struts 49,50 and attached to the distal attachment struts 51,52 to serve a similar orientation and stabilization function. Anintegral barb 25 is located about the commissural bends 27,28 that interconnect the longitudinal attachment struts 49,50. The parallel longitudinal attachment struts 49,50 are also interconnected about their distal ends by ashort interconnecting strut 81 such that an elongateclosed cell 92 is formed. The width ofcell 92 is not critical, although it may be made sufficiently narrow such that it serves to further pin or anchor theleaflets struts struts - A similar frame design is shown in
FIG. 17 which includes a singlelongitudinal attachment strut 49 to which bothleaflets leaflets strut 49 while the second leaflet lateral edge of the opposite leaflet is sewn over the first lateral leaflet edge and strut 49. The single attachment strut can be of a width that is generally uniform with respect to the other support structure or it may be made substantially thicker, such as shown inFIG. 19 . Furthermore, athicker strut 49 could includeapertures 93 or slots of any shape or length distributed therealong for receiving sutures orother attachment elements 30, such as clips, rings, etc., for affixing or anchoring the leaf outer edges thereto.FIG. 20 depicts an example having a pair of longitudinal attachment struts 49,50 with anchoringstructure 95, such as the illustrative scalloped edge that is strategically configured therealong to help prevent or limit theattachment element 97 and the valve structure itself, from sliding down the longitudinal attachment struts 49,50, especially during any retraction that may occur with a bioremodelable material. The anchoring structure can comprise any projections or other structure that provides a shoulder or irregularities along the edges of the struts that helps limit sliding ofthe leaflets along the longitudinal attachment struts 49,50. -
FIG. 18 depicts an example having generally, but not absolutely parallel longitudinal attachment struts 49,50 which slightly converge toward thedistal end 14 of the prosthesis 10 (and are spaced more distant from each other than the embodiment ofFIGs. 13-14 . The commissural bends 27,28 anddistal bends 82 interconnect the longitudinal attachment struts and form aclosed cell 92 as in the embodiment ofFIGs. 13-16 . The distal attachment struts 51,52 provide the interconnection between the oppositeclosed cells 92 as well as thedistal portion 76 of theattachment pathway 74. They also carry alateral arm 93 and together comprise thelateral support structure FIG. 18 lacksproximal support arms FIGs. 13-16 . - The
illustrative support structure 11 inFIGs. 9, 11 ,13-18 is not critical to achieve the optimal leaflet angles in thevalve structure 12 for creating larger pockets, as depicted. For example, theattachment pathway 74 of thevalve structure 12 can comprise an attachment to an outside support frame to form the illustrative configuration with theframe 32 that is not necessarily extending along theouter edges 39 of theleaflets attachment pathway 74, especially along thedistal portion 76 of the pathway. Furthermore, at least a portion of theouter edges 39 can be directly affixed to the vessel wall (such as being sutured, heat welded, or anchored with barbs, adhesives, etc.) with theframe 11 being absent or reinforcing or shaping only a limited portion of the leafletouter edges 39, thus allowing for the vein to naturally collapse (at least partially) when not filled with blood. In the example depicted in FIG. 21, theframe 11 comprises a partial support 98 of a hair-pin configuration that includes a proximal bend about eachcommissure leaflet angle 47, while thedistal portion 76 of theattachment pathway 74 comprises an alternative attachment that does not result in the leaflet material being urged thereagainst by a radially expandable frame. The angle of theleaflets longitudinal axis 64 of the prosthesis and vessel (half of thefirst angle 47 or α/2) is preferably -5-15° with a more preferred angle of 0-10° and a most preferred angle of 0-5°. The relatively small or shallow angles of the longitudinal attachment struts 49,50 about thecommissures leaflets broader pockets 35 at the base of the leaflets. The longitudinal attachment struts 49,50 of the support structure can be formed generally parallel to one another along the proximal portions of the longitudinal attachment struts 49,50 to create the maximum pocket size and greater coaptation of the leaflets. For example, thepocket 35 areas would be maximized in anattachment pathway 74 whereangle 47 is zero (or a negative angle) andangle 48 is at least 90°, such that the attachment pathway along each leaflet lateralouter edge distal portion 76 of the attachment pathway angles abruptly from the proximal portion rather than assuming a dog-leg configuration as shown in the illustrative embodiments. - The amount of contactable or
coaptable area 57 can be expressed in different ways. In the present invention, the length of the leaflet contact area 57 (orproximal portion 75 ofthe attachment pathway) in a typical venous valve prosthesis is preferably at least 2 mm and as much as 50 mm (depending on the configuration of the valve prosthesis), with a more preferred length of 5-30 mm and a most preferred range of 5-15 mm. In an average sized venous valve having a length of 25 mm, the preferred range of theleaflet contact area 57 orproximal attachment pathway 75 would be 10-80% of the prosthesis length (2.5-20 mm), assuming thevalve structure 12 is generally as long as thesupport frame 11. A more preferredleaflet contact area 57 would comprise 30-60% with 35-55% being most preferred in a prosthesis of the same general type as depicted. The relationship between leaf contact area and the diameter of the vessel may be a factor in optimizing the functionality of thevalve prosthesis 10. Preferably, the length of the longitudinal attachment struts 49,50 and/orleaflet contact area 57 is 25 to 250% of the nominal vessel diameter with a more preferred range of 25-150%. - The amount of slack in the leaflet material also helps determine howwell the leaflets coapt during retrograde flow and how large of an opening they permit during antegrade flow. Preferably, but not essentially, the prosthesis is configured such that the distance formed between the leaflets in their fully open position and the vessel diameter remains preferably between 0-100% of the vessel diameter, with a more preferred range of 20-80% ofthe vessel diameter and a most preferred range of 50-70%. By substantially orienting the longitudinal attachment struts 49,50 with the
longitudinal axis 64 of the prosthesis, less slack is necessary for optimal or extended coaptation. Not having the leaflets regularly contact the outer walls of the vessel can be especially important when using a bioremodelable material, such as an ECM, which can partially or completely adhere to the wall-over time as tissue grows into the leaflets, thus compromising the functionality of the valve. -
FIG. 12 depicts an example having different structural configuration to alter retrograde fluid flow patterns within the pocket to prevent pooling of blood or bodily fluid. Thesupport structure 11 includes proximal anddistal sections walls 38 when thevalve prosthesis 10 is deployed within thebodily passage 20. Theintermediate section 16, which includes thevalve structure 12, is narrower than each of the adjoining proximal anddistal sections bioremodelable material 44, such as a collagenous extracellular matrix (ECM) (e.g.,SIS), pericardial tissue, or fabric, such as DACRON, ePTFE, etc., is attached over or inside the support structure to enclosepassageway 62 and to help seal the prosthesis with the vessel. The proximal anddistal sections intermediate section 16 being smaller in diameter than the proximal or distal ends 13,14 of the prosthesis. By narrowing thepassageway 62 of theprosthesis 10 at the point where it transitions between theproximal section 15 and theintermediate section 17, a Venturi effect is created in which the retrograde flow is accelerate, which advantageously produces enhanced flushing action (e.g., stronger vortices) within thepockets 35 surrounding theleaflets valve prosthesis 10 to prevent pooling of blood or fluid around thepockets 35 is further enhanced in the illustrative embodiment by configuring theleaflets FIG. 11 . It is not necessary to the invention that the proximal and distal sections share the same configuration. Therespective sections single anchoring portion 24, similar to the embodiment ofFIG. 4 . - The valve structure may comprise more than the ill ustrative two leaflets or comprise leaflets of other shapes and configuration. The valve structure may also comprise a non-leaflet valve such as one or more tubular sleeves or other configurations adapted to restrict fluid flow. With regard to the support structure, it may be formed from wire, cut from a section of cannula, molded or fabricated from a polymer, biomaterial, or composite material, or a combination thereof. The pattern (i.e., configuration of struts and cells) of the anchoring portion(s) that is selected to provide radial expandability to the prosthesis is also not critical for an understanding of the invention. Any other undisclosed or incidental details of the construction or composition of the various elements of the disclosed embodiment of the present invention are not believed to be critical to the achievement of the advantages of the present invention, so long as the elements possess the attributes needed for them to perform as disclosed. The selection of these and other details of construction are believed to be well within the ability of one of even rudimentary skills in this area, in view of the present disclosure. Illustrative embodiments of the present invention have been described in considerable detail for the purpose of disclosing a practical, operative structure whereby the invention may be practiced advantageously. The designs described herein are intended to be exemplary only. Unless otherwise indicated, all ordinary words and terms used herein shall take their customary meaning as defined in The New Shorter Oxford English Dictionary, 1993 edition. All technical terms shall take on their customary meaning as established by the appropriate technical discipline utilized by those normally skilled in that particular art area. All medical terms shall take their meaning as defined by Stedman's Medical Dictionary, 27th edition.
Claims (11)
- A radially expandable artificial valve prosthesis for deployment in a bodily passage, comprising a valve structure (12) adapted for restricting fluid flow therethrough; a support structure (11) attached to the valve structure, characterized in that at least a portion of the support structure is adapted to expand upon deployment to create an artificial sinus (34) in the bodily passage adjacent said valve structure, wherein the artificial sinus is configured to create retrograde flow vortices sufficient to substantially prevent stagnation of fluid therein, wherein the support structure is expandable to a particular diameter upon deployment, and wherein the valve prosthesis (12) is configured such that the artificial sinus (34) comprises a portion of the bodily passage that is substantially unsupported by the support structure (11) such that the artificial sinus (34) is adapted to assume a diameter that is larger than the deployment diameter of the adjacent support structure.
- The radially expandable artificial valve prosthesis of claim 1, wherein the sinus has a proximal and distal end such that support structure include a first portion disposed adjacent to the proximal end of the sinus and an interconnecting second portion adjacent to the distal end of the sinus.
- The radially expandable artificial valve prosthesis of claim 2, wherein the first and second portions of the support structure are interconnected by a pair of oppositely placed struts.
- The radially expandable artificial valve prosthesis of claim 3, wherein in the valve structure is connected at least in part to the oppositely placed struts.
- A radially expandable artificial valve prosthesis for deployment in a bodily passage, comprising a valve structure (12) adapted for restricting fluid flow therethrough; a support structure (11) attached to the valve structure, characterized in that at least a portion of the support structure is adapted to expand upon deployment to create an artificial sinus (34) in the bodily passage adjacent said valve structure, wherein the artificial sinus is configured to create retrograde flow vortices sufficient to substantially prevent stagnation of fluid therein, wherein the support structure comprises a first end and a second end, wherein the valve structure (12) is located about the first end and the first end of the support structure (11) has an enlarged diameter that is configured to create the artificial sinus (34) about the valve structure.
- A radially expandable artificial valve prosthesis for deployment in a bodily passage, comprising a valve structure adapted for restricting fluid flow therethrough; a support structure attached to the valve structure, characterized in that at least a portion of the support structure is adapted to expand upon deployment to create an artificial sinus in the bodily passage adjacent said valve structure, wherein the artificial sinus is configured to create retrograde flow vortices sufficient to substantially prevent stagnation of fluid therein, wherein the expandable support structure includes an intermediate portion (16), a proximal portion (15), and a distal portion (17); wherein the intermediate portion (16) has a diameter that is larger than the diameter of the distal and proximal portions such that the artificial sinus (34) is created thereabout.
- The radially expandable artificial valve prosthesis of claim 6, wherein the intermediate, proximal, and distal portion comprise interconnected segments.
- The radially expandable artificial valve prosthesis of claim 7, wherein the intermediate portion comprises a first and a second radially expandable anchoring portion that each include a first end, a second end and at least one constraining mechanism configured with the first end and the second end of the first and second radially expandable anchoring portion being of different diameters such that the first and second radially expandable anchoring portions collectively form the artificial sinus.
- The radially expandable artificial valve prosthesis of claim 8, wherein the intermediate portion comprises the artificial sinus that forms a expanded portion extending outward from adjacent portions of the collapsible support structure.
- The radially expandable artificial valve prosthesis of any one of the preceding claims, wherein said valve structure includes at least two leaflets adapted to restrict fluid flow therethrough.
- The radially expandable artificial valve prosthesis of any preceding claim, wherein the support structure comprises a superelastic material and preferably comprises nitinol.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP09170581.4A EP2133039B1 (en) | 2003-04-24 | 2004-04-21 | Artificial valve prosthesis with improved flow dynamics |
EP14183091.9A EP2926772A1 (en) | 2003-04-24 | 2004-04-21 | Artificial valve prosthesis with improved flow dynamics |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US46514103P | 2003-04-24 | 2003-04-24 | |
US53078103P | 2003-12-18 | 2003-12-18 | |
PCT/US2004/012430 WO2004096100A1 (en) | 2003-04-24 | 2004-04-21 | Artificial valve prosthesis with improved flow dynamics |
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EP14183091.9A Division EP2926772A1 (en) | 2003-04-24 | 2004-04-21 | Artificial valve prosthesis with improved flow dynamics |
EP09170581.4A Division EP2133039B1 (en) | 2003-04-24 | 2004-04-21 | Artificial valve prosthesis with improved flow dynamics |
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EP1615595A1 EP1615595A1 (en) | 2006-01-18 |
EP1615595B1 true EP1615595B1 (en) | 2009-10-21 |
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EP14183091.9A Pending EP2926772A1 (en) | 2003-04-24 | 2004-04-21 | Artificial valve prosthesis with improved flow dynamics |
EP04760327A Expired - Lifetime EP1615595B1 (en) | 2003-04-24 | 2004-04-21 | Artificial valve prosthesis with improved flow dynamics |
EP09170581.4A Expired - Lifetime EP2133039B1 (en) | 2003-04-24 | 2004-04-21 | Artificial valve prosthesis with improved flow dynamics |
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Application Number | Title | Priority Date | Filing Date |
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EP14183091.9A Pending EP2926772A1 (en) | 2003-04-24 | 2004-04-21 | Artificial valve prosthesis with improved flow dynamics |
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Application Number | Title | Priority Date | Filing Date |
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EP09170581.4A Expired - Lifetime EP2133039B1 (en) | 2003-04-24 | 2004-04-21 | Artificial valve prosthesis with improved flow dynamics |
Country Status (8)
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US (4) | US8221492B2 (en) |
EP (3) | EP2926772A1 (en) |
JP (1) | JP4940388B2 (en) |
AT (1) | ATE446061T1 (en) |
AU (1) | AU2004233848B2 (en) |
CA (1) | CA2523262C (en) |
DE (1) | DE602004023708D1 (en) |
WO (1) | WO2004096100A1 (en) |
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- 2004-04-21 JP JP2006513221A patent/JP4940388B2/en not_active Expired - Lifetime
- 2004-04-21 US US10/554,494 patent/US8221492B2/en active Active
- 2004-04-21 AU AU2004233848A patent/AU2004233848B2/en not_active Expired
- 2004-04-21 AT AT04760327T patent/ATE446061T1/en not_active IP Right Cessation
- 2004-04-21 EP EP14183091.9A patent/EP2926772A1/en active Pending
- 2004-04-21 WO PCT/US2004/012430 patent/WO2004096100A1/en active Application Filing
- 2004-04-21 CA CA2523262A patent/CA2523262C/en not_active Expired - Lifetime
- 2004-04-21 DE DE602004023708T patent/DE602004023708D1/en not_active Expired - Lifetime
- 2004-04-21 EP EP04760327A patent/EP1615595B1/en not_active Expired - Lifetime
- 2004-04-21 EP EP09170581.4A patent/EP2133039B1/en not_active Expired - Lifetime
- 2004-08-30 US US10/828,716 patent/US7618447B2/en active Active
-
2009
- 2009-11-09 US US12/614,878 patent/US20100131055A1/en not_active Abandoned
-
2012
- 2012-07-16 US US13/550,229 patent/US9421096B2/en active Active
Cited By (17)
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US11419720B2 (en) | 2010-05-05 | 2022-08-23 | Neovasc Tiara Inc. | Transcatheter mitral valve prosthesis |
US11413139B2 (en) | 2011-11-23 | 2022-08-16 | Neovasc Tiara Inc. | Sequentially deployed transcatheter mitral valve prosthesis |
US11497602B2 (en) | 2012-02-14 | 2022-11-15 | Neovasc Tiara Inc. | Methods and apparatus for engaging a valve prosthesis with tissue |
US10940001B2 (en) | 2012-05-30 | 2021-03-09 | Neovasc Tiara Inc. | Methods and apparatus for loading a prosthesis onto a delivery system |
US11617650B2 (en) | 2012-05-30 | 2023-04-04 | Neovasc Tiara Inc. | Methods and apparatus for loading a prosthesis onto a delivery system |
US11389294B2 (en) | 2012-05-30 | 2022-07-19 | Neovasc Tiara Inc. | Methods and apparatus for loading a prosthesis onto a delivery system |
US11389291B2 (en) | 2013-04-04 | 2022-07-19 | Neovase Tiara Inc. | Methods and apparatus for delivering a prosthetic valve to a beating heart |
US11357622B2 (en) | 2016-01-29 | 2022-06-14 | Neovase Tiara Inc. | Prosthetic valve for avoiding obstruction of outflow |
US11464631B2 (en) | 2016-11-21 | 2022-10-11 | Neovasc Tiara Inc. | Methods and systems for rapid retraction of a transcatheter heart valve delivery system |
US10856984B2 (en) | 2017-08-25 | 2020-12-08 | Neovasc Tiara Inc. | Sequentially deployed transcatheter mitral valve prosthesis |
US11793640B2 (en) | 2017-08-25 | 2023-10-24 | Neovasc Tiara Inc. | Sequentially deployed transcatheter mitral valve prosthesis |
US11737872B2 (en) | 2018-11-08 | 2023-08-29 | Neovasc Tiara Inc. | Ventricular deployment of a transcatheter mitral valve prosthesis |
US11602429B2 (en) | 2019-04-01 | 2023-03-14 | Neovasc Tiara Inc. | Controllably deployable prosthetic valve |
US11491006B2 (en) | 2019-04-10 | 2022-11-08 | Neovasc Tiara Inc. | Prosthetic valve with natural blood flow |
US11779742B2 (en) | 2019-05-20 | 2023-10-10 | Neovasc Tiara Inc. | Introducer with hemostasis mechanism |
US11311376B2 (en) | 2019-06-20 | 2022-04-26 | Neovase Tiara Inc. | Low profile prosthetic mitral valve |
US11931254B2 (en) | 2019-06-20 | 2024-03-19 | Neovasc Tiara Inc. | Low profile prosthetic mitral valve |
Also Published As
Publication number | Publication date |
---|---|
US20070260327A1 (en) | 2007-11-08 |
EP2926772A1 (en) | 2015-10-07 |
AU2004233848B2 (en) | 2010-03-04 |
EP2133039A1 (en) | 2009-12-16 |
DE602004023708D1 (en) | 2009-12-03 |
US8221492B2 (en) | 2012-07-17 |
US7618447B2 (en) | 2009-11-17 |
AU2004233848A1 (en) | 2004-11-11 |
ATE446061T1 (en) | 2009-11-15 |
US20130018453A1 (en) | 2013-01-17 |
CA2523262A1 (en) | 2004-11-11 |
US20100131055A1 (en) | 2010-05-27 |
JP2006524119A (en) | 2006-10-26 |
JP4940388B2 (en) | 2012-05-30 |
EP2133039B1 (en) | 2014-10-08 |
WO2004096100A1 (en) | 2004-11-11 |
EP1615595A1 (en) | 2006-01-18 |
US9421096B2 (en) | 2016-08-23 |
US20040260389A1 (en) | 2004-12-23 |
CA2523262C (en) | 2012-01-24 |
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